Kubota BH77 hydraulic line question

[oldafretired]

Can the hydraulic line going to a BH77 backhoe on a L3901 be used to power some other implement when the backhoe is off the tractor? When the backhoe is off, the line going to the backhoe is looped back into the connector on the tractor the line from the backhoe goes to. Sorry but I'm pretty ignorant about this stuff.

 

[sea2summit]

You could run a log splitter or other implements that require hydraulics. It has a constant flow so you can't doing things like a hydraulic top-link or anything with that particular hose.

 

[oldafretired]

You could run a log splitter or other implements that require hydraulics. It has a constant flow so you can't doing things like a hydraulic top-link or anything with that particular hose.

So it would work to power a hydraulic feeder for a chipper?

 

[Tractor Seabee]

Does your L have a power beyond circuit? What ever valve(s) you use on an implement will have to maintain the PB circuit or nothing else will work. That means 3 hoses. Maybe you don't need to have the FEL and 3 Point working then ignore the PB connector and hook up to P and T. I replaced the valve on my splitter to a PB type.

Ron

 

[oldafretired]

Does your L have a power beyond circuit? What ever valve(s) you use on an implement will have to maintain the PB circuit or nothing else will work. That means 3 hoses. Maybe you don't need to have the FEL and 3 Point working then ignore the PB connector and hook up to P and T. I replaced the valve on my splitter to a PB type.

Ron

I don't know the terminology but this is how the lines go:

This is the hydraulic block under the right foot area:

The owner's manual shows that the left port is from implement (outlet)
The top right is to implement
The bottom right is from implement (tank port)


This is the back of the tractor. The hose is looped back on itself to the connector on the left. The hose (right side which connects to the back hoe) goes to the left port on the hydraulic block under the right foot area from the back hoe.

The left side with the connector which connects to a hose from the backhoe comes from the port labeled "T" on the 3rd function valve.

The hose from the other port labeled "P" on the 3rd function valve goes to port next to the green stripe on the front loader valve:

The hose next to the pink stripe on the front loader valve goes to the top right (to implement) port on the hydraulic block.

The hose below that on the front loader valve which is just visible on the next photo goes to the from implement (tank port) on the hydraulic block.

Is this info of any use?

 

[KyleH]

You could put a valve in series with those hoses, and another tank drain hose from the valve or whatever you are operating, but you can get a kit that uses the factory ports on the side of the transmission and will have one or two valves. There's also the kit from the B2630 that will fit if you do a bit of trimming. If you go onto Kubota's parts webpage you can see the optional kits available.

 

[Tractor Seabee]

Your L is piped the same as my BX. The looped hose goes from the Power, (hydraulic pressure supply) usually labeled "P" for power, to the next valve in the circuit. That hose provides the power to the BH when it is in place. W/O the BH it is looped to maintain the circuit downstream. W/the BH one of the other hoses is the Power Beyond, usually labeled "PB", which sends the power from the BH to the other parts of the circuit, probably the 3 point hitch then the FEL. The other hose from the BH is the used fluid from the BH back to the hydraulic reservoir (Tank), normally labeled "T". If you notice the hose fittings and the lengths prevent you from hooking up the BH wrong.

The BH hydraulics is the easiest place to add in things you will operate from the ground as the valve(s) are on the implement.

We all have had to learn all these abbreviations as we go along on the forum. Just like operating your tractor there is a learning curve. In addition to the Operating Manual I recommend getting the Workshop Manual (WSM) and the Parts Manual. These will improve your learning curve and save you money doing a lot of your own work. When special tools are needed that is when to look at sending out to a dealer shop. I am assuming you are mechanically inclined. Keep asking questions; we all are a fountain of something, both the good and the bad.

LOL, Ron

 

[oldafretired]

Your L is piped the same as my BX. The looped hose goes from the Power, (hydraulic pressure supply) usually labeled "P" for power, to the next valve in the circuit. That hose provides the power to the BH when it is in place. W/O the BH it is looped to maintain the circuit downstream. W/the BH one of the other hoses is the Power Beyond, usually labeled "PB", which sends the power from the BH to the other parts of the circuit, probably the 3 point hitch then the FEL. The other hose from the BH is the used fluid from the BH back to the hydraulic reservoir (Tank), normally labeled "T". If you notice the hose fittings and the lengths prevent you from hooking up the BH wrong.

The BH hydraulics is the easiest place to add in things you will operate from the ground as the valve(s) are on the implement.

We all have had to learn all these abbreviations as we go along on the forum. Just like operating your tractor there is a learning curve. In addition to the Operating Manual I recommend getting the Workshop Manual (WSM) and the Parts Manual. These will improve your learning curve and save you money doing a lot of your own work. When special tools are needed that is when to look at sending out to a dealer shop. I am assuming you are mechanically inclined. Keep asking questions; we all are a fountain of something, both the good and the bad.

LOL, Ron

Thanks for the great advice. I plan to get the two manuals you recommended.

So I guess it is OK to hook up the hydraulic feed of a chipper to the BH connectors. I'm thinking of buying a chipper with a hydraulic feeder and the person in this tread seems to be powering his chipper from a power beyond port which I assume is pretty much what I'll be doing.

http://www.tractorbynet.com/forums/hydraulics/223318-jd-2520-power-beyond-power.html

 

[Tractor Seabee]

Just hook your feeder circuit same as the BH. If you want to move the tractor w/the chipper on it; make sure your feeder valve has the three ports, P, PB, and T. Some valves can be modified with a plug to activate the PB port. Theya re brand specific. It may not come that way.

Ron

 

[oldafretired]

Just hook your feeder circuit same as the BH. If you want to move the tractor w/the chipper on it; make sure your feeder valve has the three ports, P, PB, and T. Some valves can be modified with a plug to activate the PB port. Theya re brand specific. It may not come that way.

Ron

Ron, thank you for all your help. Another dumb question: What does moving the tractor with the chipper hooked up have to do with the connections? I think the BH is the end in the chain from the PB port on the loader valve after the 3rd function valve. The line from the BH ends at the implement outlet port on the hydraulic block under the right foot.

Thanks again!